Our B777s automatically go to RNP4 in Oceanic a couple of minutes after leaving domestic airspace (entering KZAK NZZO YBBB it's 4, I think it is the same in RJJJ but I haven't been that way for a while).
I assume the ND displays of RNP and ANP below the aircraft triangle are the same on all versions?
I see from FAA Order 8400.12 (the one I am referring to is dated 11/9/11- may have changed since then) that the only Navspecs for Oceanic and remote area ops are RNP10 and RNP4.